Acoustic and optical phonons in quasi-two-dimensional MPS3 antiferromagnetic semiconductors

Author:

Wright Dylan12ORCID,Ebrahim Nataj Zahra12ORCID,Guzman Erick1ORCID,Polster Jake3ORCID,Bouman Menno3ORCID,Kargar Fariborz124ORCID,Balandin Alexander A.12ORCID

Affiliation:

1. Department of Materials Science and Engineering, University of California 1 , Los Angeles, California 90095, USA

2. California NanoSystems Institute, University of California 2 , Los Angeles, California 90095, USA

3. KLA Instruments Group 3 , West Covina, California 91791, USA

4. Materials Research and Education Center, Department of Mechanical Engineering, Auburn University 4 , Auburn, Alabama 36849, USA

Abstract

We report the results of the investigation of the acoustic and optical phonons in quasi-two-dimensional antiferromagnetic semiconductors of the transition metal phosphorus trisulfide family with Mn, Fe, Co, Ni, and Cd as metal atoms. The Brillouin–Mandelstam and Raman light scattering spectroscopies were conducted at room temperature to measure the acoustic and optical phonon frequencies close to the Brillouin zone center and the Γ−A high symmetry direction. The absorption and index of refraction were measured in the visible and infrared ranges using the reflectometry technique. We found an intriguing large variation, over ∼28%, in the acoustic phonon group velocities in this group of materials with similar crystal structures. Our data indicate that the full-width-at-half-maximum of the acoustic phonon peaks is strongly affected by the optical properties and the electronic bandgap. The acoustic phonon lifetime extracted for some of the materials was correlated with their thermal properties. The results are important for understanding the layered van der Waals semiconductors and assessing their potential for optoelectronic and spintronic device applications.

Funder

National Science Foundation

Publisher

AIP Publishing

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